Work table with sine bar adjustment



' NOV. 26; 194-6. SEALEY WORK TABLE WITH SINE BAR ADJUSTMENT Filed Feb;4, 1944 5 Sheets-Sheet 1 IN vaum KL Lame EDwuv may.

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Nov. 26, 1946. J E. SEALEIY 2,411,641

WORK TABLE WITH SINE BAR ADJUSTMENT Filed Feb. 4, 1944 3 Sheets-Sheet 2INvENfYoR- nwm EALEY b9 i Y ATTOKNfifS.

1 Nov. 26, 1946. E, SEAL Y 2,411,641

WORK 'TABLE WITH $11111 BAR. ADJUSTMENT Filed Feb. 4. 1944 3Sheets-Sheet 3 INVENTQR LOuns E. DWIN 5EALEY.

Patented Nov. 26, v1946 WORK TABLE WITH -SINE BAR ADJUSTMENT- I LouisEdwin Sealev, Carsham, England, assignor to Papworth Limited, Bristol,England, a

British' company v ineeen February 4, 1944, Serial No. 521,157 Y 7 InGreat Britain November 10, 194.],

can be obtained by other devicesused for similar purposes. For thesepurposes'I utilize a known arrangement, of the kind in which a'circularwork table rotatable about its own centre is also mounted to swing in avertical plane,that is, its axis of rotation can be tilted about a shaftr'bearing member in a pillar on the base of the device.

According to the present invention, the shaft itself is pivotallyconnected with the pillar, ena lin a third adjus m nt o be e iected toduce .a compound. angle of tilting of the table. The extent ofadjustment in any plane is regulated by a sine bar, and locking meansare provided to secure the't ble .firm y in e positions to which'it hasthus been adjusted.

Inorder that the said invention may'beclearly understood and readilycarried; into efiect, the

same will now be described more fully with reference to the drawingsaccompanying which'illustrate an exemplification of the invention.

Figure 1 representsthe apparatus in si'deelevation, with the work tablein zero or horizontal position. 7

Figure 2 is a view corresponding with that in Figure 1, but with thetable swung through: an angle of 90 degrees into a vertical position;

Figure '3 is a plan of the table, partly broken away to enable thelocking mechanism of the table to be seen. j s

Figure 4 is an elevation viewedat right angles tothat in Figure 1. p H II Figure 5 is an elevation corresponding with that in Figure 4, with thetable swung to the left 90 degrees into a vertical position.

Figure 6 is a 'view similar to that in 5, 7

but with the table degrees. I I

Figure '7 isa viewsimilar to Figure '1, with some parts omitted, toshowthe sine bar in one of its zero positions.

Figure 8' is a View similar to Figure 2 showing the sine bar with slipgauges between its disc d and the setting pad h swung to therightthrough Figure 9. is a plan; and Figures 10, 11, and 12,.

elevations similar to Figures 4, 5, and 6 respectively, showing the sinebar in position in each case.

In the drawings e indicates a bed or base plate, on which is a pillar 5|to which a shaft c is rotation about; the said shaft 0. The end oftheshaft remote from its pivot pin d is supported by a bearing head 9, andthe head 9 is intuirn supportedby two pairs of links u and v, thelinks ubeing pivotally connected at a: with the ba'seIe, and the links 0pivotally connected with the "head g atw. An arm a pivoted at b to thebase ,6: passes through a block J at which the links u and 1) meet, andas the lower half of this block is split, and a pin 2 c jnnecting thetwo pairs of links passes through the saidlo'wer half, when th P ened hebloc a d. l n s a'r therebysecured in adjusted position, I, as seenclearly in Figure '2. f

On the base 6 are stops or abutments f,,z l, n, and o-andstopsia', 1''and' depend o he bearing a. f A sine bar I having at one end a discdhcan be attached at either side of pin 01, at 9: or 1 (Figure 9) and atthe end of the ex tension shaft c at 2 which shaft is concentric with atlqj ut' is 'fix d o and moves w t table support it. Asseen' in Figure4, a slip II; can be inserted between the stops 2' and 1' to sup.-

port the table in a position parallel withthe' base, although the Itableis free to swivel'about the shaft 0. The periphery of the table I) isgraduated as seen in Figure l, and in the table top are' four T slots 54,(see Figure 3) in square formation, for the attachment of thework-piece to the table.v In the zero position; that is with 0 on thetable graduations' opposite ,0 on a graduated plate 5 on the bearing a,two of these slots are exactly parallel with the centre line of thehinged shaft 0, and the .other two slots ex.- actly at right anglesthereto. A tapered spigot r is permanently secured to the table 11, andcan be gripped'by a taper bored band 1 con,- trolled by a screw p. Byturning the screw 1b in an anti-clockwise direction the band q isallowed to release its hold on the spigot T, when thetable can berotated about its ce t e ntil h an A earin a carrying t e position towhich it has been swung around the shaft 0, the bearing support a issplit, and two screws t passed through the bifurcated lower portion.thereof, each of the said screws having square portions at each end, sothat the screws can be tightened or slackened from either side which maybe easily accessible when the table has been tilted about the shaft 0,for instance as in Figure 5 or Figure 6.

Assuming for example that a tilting angle'of 10 degrees is required inthe plane of swinging about the hinge pin d, and an angle of 2 2'degrees in the plane of swinging about the-axis of the shaft 0, it isnecessary in the first place to ascertain that the stops g and 1 meet(see Figure 1) then a slip h 2.25 inches long is inserted between thestops 12 and ;i (Figure 4) thus bringing the table into a truehorizontal plane with the base es; the table is pushed firmly toward thebase and locked relatively to the shaft by means of the two screws t andthe screw 2 passing through the clamping block y, the sine bar I fixedon the end of the shaft c (Figure 9) and a 1 inch slip g placed betweenthe abutment c on the base and the disc 11 on the sine bar (Figure 10),the nut e tightened on the extension of shaft 0 concentric with shaft 0so as to clamp the sine bar I, at the same time applying a lightpressure on the disc 01 to make contact with the slip g The constant for22 degrees is then selected from the sine bar table (5") which is 1.873,and a combination of slips to make up this figure is then required. Thetwo screws t (Figure 2) are then'slackened and the table tilted,bringing the sine bar f away from the l slip gauge g until the stops itand I meet. The slips making up the combination are now placed on top ofthe 1 inch slip g or alternatively the 1 inch slip can be removed and 1inch added to make the combination 2.873. The table is then swunglightly back until the disc d of the sine bar makes contact with the topof the slips, the two screws t locked, and the nut 6 sine bar and slipsremoved. Next, to obtain the angle of 10 degrees in the plane swivellingabout the pin 12, the sine bar is attached to the pin d in the positionmarked y in Figure 9, again placing a 1 inch slip between the disc 01 ofthe sine bar and the abutment h on the base 2 and the locking operationis repeated. The sine bar is then in a true parallel plane with the base6. The constant for 10 degrees is given as .8682, so that if the screw.2 is slackened and the table pushed back until the hinge pin projection51' meets the stop pin 0 (Figure 2) slips can be placed on topof the 1inch slip to give 1.8682, then the table brought down until the disc dtouches the top of the slips, the screw 2 is locked, and the sine bar,nut e and slips removed. The table is now ready for use with a compoundangle the components of which are 10 degrees and 22 degrees res ec=tively.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is:

1. In a work table, a base, a pillar rising from said base, ashaftpivotally mounted on said pillar to swing in a vertical plane, a bearingto carry va work table, said bearing comprising dependent membersrockable on said shaft in a vertical plane at right angles with theaforesaid vertical plane,

said work table being rotatable on said bearing to obtain a compoundadjustment of said work table, an arm pivoted on said base carrying abifurcated block, said block being movable longitudinally of said arm,links pivoted to said base and to said bearing respectively and havingtheir joint meeting at said block, a pin connecting said links andpassing through the split part of said block to tighten the latter tomaintain the said links and bearing in the position to which they havebeen adjusted. v

2. In a work table, a base, a pillar rising from said base, a shaftpivotally mounted on said pillar to swing in a vertical plane, a bearingmounted on said shaft to swing in a plane at right angles with saidvertical plane, a table carried on and rockable integrally with saidbearing in a vertical plane and rotatable thereon to obtain a compoundadjustment of said work table, locking means rovided to maintain saidadjustment, and stops arranged to permit location of the work tablepositively in horizontal and vertical positions.

3. In a work table, a base, a pillar rising from said base, a shaftpivotally mounted on said pillar to swing in a vertical plane, a bearingmounted on said shaft to swing in a plane at right angles with saidvertical plane, a table carried on and rockable integrally with saidbearing in a vertical plane and rotatable thereon to obtain a compoundadjustment of said work table,

locking means provided to maintain said adjustment, stops arranged topermit location of the work table positively in horizontal and verticalpositions, and further stops permitting location of the work table in aplane inclined at to the horizontal in a'movement of adjustment aboutsaid shaft.

4. In a work table, a base, a pillar rising from said base, a pivot pincarried in the pillar, a shaft upon the pivot pin and disposedperpendicularly thereto for swinging in a vertical plane, a bearing tocarry a Work table, said bearing comprising dependent members rockableon said shaft in a vertical plane at right angles with the aforesaidvertical plane, said work table being rotatable on said bearing toobtain a compound adjustment of said work table, a sine bar, means uponthe pivot pin of said shaft and the shaft itself for removableattachment of said sine bar to permit the latter to co-operate withinterchangeable slip pieces and thus to regulate the adjustment of thepivot pin and shaft relatively to the base, and locking means tomaintain the said adjustment.

LOUIS EDWIN SEALEY.

